Demixing processes in AgPd superlattices.
نویسندگان
چکیده
The present scanning tunneling microscopy (STM) study describes the growth of silver-palladium heterostructures at room temperature, with ab initio simulations of ordered AgPd phases supporting the interpretation of STM images. First, the growth of Pd on an Ag(111) surface proceeds in a multilayer mode, leading to the formation of a columnar structure. Then, upon Ag deposition on this structure, Ag and Pd partially mix and form a two-dimensional AgPd alloy on top of the columns. Finally, an atomically flat Ag(111) surface is restored, and two-dimensional growth continues. An interpretation of this peculiar growth mode including interfacial alloying is proposed based on thermodynamic and kinetic arguments.
منابع مشابه
Synthesis of open-mouthed, yolk–shell Au@AgPd nanoparticles with access to interior surfaces for enhanced electrocatalysis† †Electronic supplementary information (ESI) available: Detailed experimental procedure, supplementary TEM images and UV-vis spectra of as-prepared samples, possible formation mechanism of core–shell Au@AgPd NPs, half-encased, core–shell Au@AgPd NPs, conventional yolk–shell Au@AgPd NPs and open-mouthed, yolk–shell Au@AgPd NPs, HAADF-STEM image, HAADF-STEM-EDS images and cross-sectional compositional line profiles of the conventional YS Au@AgPd NPs, UV-vis spectra of conventional and open-mouthed YS Au@AgPd NPs obtained in different solvents of varying refractive indexes, electrocatalytic data of as-prepared samples. See DOI: 10.1039/c5sc01088h
State Key Laboratory of Crystal Materials, S China. E-mail: [email protected] Ian Wark Research Institute, University Australia † Electronic supplementary information procedure, supplementary TEM images samples, possible formation mechan half-encased, core–shell Au@AgPd NPs, and open-mouthed, yolk–shell Au@ HAADF-STEM-EDS images and cross-sect conventional YS Au@AgPd NPs, UV open-mouthed YS Au@A...
متن کاملThe connective tissue response to Ti, NiCr and AgPd alloys.
The aim of the study was to compare the connective tissue response of Lewis rats to Ti, NiCr and AgPd alloys. It was found that implants were covered by collagen-rich, well vascularized capsules. Titanium was covered by the thinnest capsule (57 ± 20 μm) and AgPd alloy was covered by the thickest capsule (239 ± 50 μm). The PCNA+ cell prevalence in the capsules was lower for titanium than for AgP...
متن کاملKinetics of fluid demixing in complex plasmas: Domain growth analysis using Minkowski tensors.
A molecular dynamics simulation of the demixing process of a binary complex plasma is analyzed and the role of distinct interaction potentials is discussed by using morphological Minkowski tensor analysis of the minority phase domain growth in a demixing simulated binary complex plasma. These Minkowski tensor methods are compared with previous results that utilized a power spectrum method based...
متن کاملMolecular versus macroscopic perspective on the demixing transition of aqueous PNIPAM solutions by studying the dual character of the refractive index.
The phase separation of aqueous poly(N-isopropyl acrylamide) (PNIPAM) solutions is known to strongly affect their volume expansion behaviour and the elastic moduli, as the latter are strongly coupled to the macroscopic order parameter. On the molecular scale, considerable changes in H-bonding and hydrophobic interactions, as well as in the structure govern the demixing process. However, the rel...
متن کاملThe Pronouncing Dictionary of Austrian German (AGPD) and the Austrian Phonetic Database (ADABA): Report on a large Phonetic Resources Database of the three Major Varieties of German
The paper gives a comprehensive overview over the results, the concepts and the methods which were developed and used to create the Pronouncing Dictionary of Austrian German (ÖAWB/AGPD) and the Austrian Pronouncing Database ADABA. The AGPD contains 42.000 entries which are based on a large audio corpus of 75.964 realisations of two model speakers each from Austria, Germany and Switzerland. The ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Journal of physics. Condensed matter : an Institute of Physics journal
دوره 21 31 شماره
صفحات -
تاریخ انتشار 2009